Wall plug



FIG. 1 is a top planar view of a wall plug;

FIG. 2 is a bottom planar view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a rear, right, top isometric view thereof.

The broken line showing is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a wall plug, as shown and described. 